Cc Geometry H Hw 26 Worksheet With Answers Page 5
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10Example 2: What are sine and cosine values for θ = 0
and 90
?
0
0
In the figure to the right, the hypotenuse c
of right ΔABC is the radius of a circle
which has a radius of length 1 unit.
1
• c = ___
• sin θ =
=
and cos θ =
=
.
As θ gets closer to 0
0
, a __________ and sin θ approaches ___.
As θ gets closer to 0
0
, b __________ and cos θ approaches ___.
Definitions: sin 0
0
= _____ and cos 0
0
= _____
As θ gets closer to 90
0
, a __________ and gets closer to ___, and the value of
sin θ approaches ___.
As θ gets closer to 90
, b __________ and gets closer to ___, and the value of
0
cos θ approaches ___.
Definitions: sin 90
0
= _____ and cos 90
0
= _____
**Since sin 0
= cos 90
, and cos 0
= sin 90
, this is consistent with the fact that
0
0
0
0
the sine of an angle equals the____________________________________.**
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